Shutter-fastener



Modlj' B. D. SALISBURY 8L H. A. WILBUR.

Shutter Fastener.

No. 240,274. Patented April 19,1881.

Wi 55555 I \/5 i131 I w A vwkw W UNITED STATES PATENT OFFICE.

BENJAMIN D. SALISBURY, OF BOSTON, AND HENRY A. WILBUB, OF SOMER- VILLE, MASSACHUSETTS, ASSIGNOBS TO SAID SALISBURY AND W. H. M. AUSTIN, OF BOSTON, MASSACHUSETTS.

SHUTTER-FASTENER.

SPECIFICATION forming part of Letters Patent No. 240,274, dated April 19, 1881.

Application filed January 30, 1880.

To all whom it may concern Be it known that we, BENJ. I). SALISBURY, of Boston, county of Sufiolk, and HENRY A. WILBUR, of Somerville, county of Middlesex,

State of Massachusetts, have invented an Improvement in Blind-Fastenings, of which the following description, iri connection with the accompanying drawings, is a specification.

This invention relates to improvements in To blind-fastenings, and has for its object the production of a blind fastening from wire, so shaped or formed that the tang may be easily driven 'strai ght into the blind, and which, when driven, shall be securely held in the wood of the blind by reason of barbs, indentations, or

' corrugations on the tang, as hereinafter described.

Our invention consists, essentially, in a spring-metal fastening bent or shaped as hereinafter described, to form an offset which serves as a drivin g-head, the face of which, to be struck by the hammer, is thrown above the level of the arm of the spring adjacent to the tang; also, in a spring-metal blind-fastening provided with an indented tang to retain the same in the wood of the blind.

In other blind-fastenin gs composed of sprin gwire the wire has been bent near its end to form a tang; but the junction of the tang and 0 arm of the spring has presented a segmental or round corner, so called and when the tang was being driven the arm was also struck by the hammer, and it has been found quite impossible to drive the said tang part straight 3 5 into the wood. The tang so driven into the wood at an angle makes such a hole, and is so located with relation to the spring-arm and the direction of the strain upon it that in use the movement of the spring is very apt to draw the tang from or so loosen it in the wood that it does not hold the arm firmly, so the spring becomes ineffectual for the purpose intended.

Figure 1 represents in side elevation a por- 4 5 tion of a blind with one of our fastenings attached, the blind being closed; Fig. 2, an end view of a fastening, showing the tang indented to form barbs; Fig. 3, a side elevation of a fastening, showing the tang indented as by providing it with a series of annular grooves; and Fig. 4 represents a form of blind-fastening now commonly used.

The fastening is-herein shown as composed of a piece of wire of suitable length and diameter. At its outer end the wire is bent or curved to form an eye, a, is substantially straight from the eye to the point D, is bent or inclined as between I) and c, is again made substantially straight between the points 0 to d, and parallel substantially with the part between a to b, the portion c to 01 serving as a fulcrum or rest to bear against the bottom of the blind g. Beyond the point at the wire is bent to form the tang f, and in so doing is left, as shown in Figs. 1 and 2, so as to form a headlike part, e, thrown out or offset beyond the part of the arm between the points 0 to d, the head so formed being shaped and adapted to be struck by a hammer and to be driven straight without striking the arm.

Fig. 4 represents a form of fastening now in common use. In that figure it will be noticed that the tang is not bentat a right angle to the main part, and when driving the tanginto the wood the arm must be struck by the hammer, which tends to bend the wire at the junction of the arm and tang, and, further, the tang will enter the wood diagonally and make a hole from which it is easily partially drawn and made loose by the strain upon the spring when the outer end of the arm is riding over the catch which holds the blind closed.

In our fastening the tang turns from the main spring-arm at substantially a right angle, and by reason of the head e is easily driven by a hammer straight into the wood.

To insure permanent hold of the tang in the wood and obviate the use of a staple, which is commonly made to span the wire near the tang, we have indented the tang, as shown in the 0 drawings, or provided it with barbs or projections, which, when the tang is driven, engage the wood and prevent the withdrawal of the same, unless by a very hard pull.

We do not broadly claim a spring-arm for a 5 blind-fastening, nor do we claim, broadly, indenting or barbing a piece of wire tomake it hold in the wood.

We claim-- In testimony whereof we have signed our 1. As animproved article of manufacture, a names to this specification in the presence of blind-fastenin g composed of a spring-arm protwo subscribing witnesses.

Vided with a tang and bent as described and 5 shown, to throw out a head-forming part, c, BENJAMIN D. SALISBURY.

and form a fulcrum part, 0 cl, and spring part HENRY A. WILBUR.

I) c, all substantially as shown and described.

2. The blind-fastening spring composed of Witnesses:

wire, bent as shown and described, and hav- G. W. GREGORY,

1o ing an indented or barbed tang, all as set forth. N. E. G. WHITNEY. 

